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Apr 5, 2021 at 13:46 comment added Abdelmalek Abdesselam @DirkWerner: You are right of course, but in my view, such a proof based on the machinery of the Riemann integral would be a bit of a hack. The combinatorial lemma is stated in very elementary terms and I would prefer a proof which is as elementary.
Apr 3, 2021 at 20:45 comment added Dirk Werner If you are willing to use Riemann integrals, the combinatorial lemma can be derived by integrating the indicator functions of the intervals involved.
Apr 2, 2021 at 22:55 history edited Abdelmalek Abdesselam CC BY-SA 4.0
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Apr 2, 2021 at 20:50 comment added Abdelmalek Abdesselam In fact no need for double induction. Induction on $p$ is enough as in the nice answer by Iosif.
Apr 2, 2021 at 20:35 history answered Abdelmalek Abdesselam CC BY-SA 4.0